netdev - Re: [PATCH v3 net] qede: fix firmware halt over suspend and resume

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Date: Thu, 17 Aug 2023 09:11:36 +0200
From: Simon Horman <horms@...nel.org>
To: Manish Chopra <manishc@...vell.com>
Cc: kuba@...nel.org, netdev@...r.kernel.org, aelior@...vell.com,
	palok@...vell.com, njavali@...vell.com, skashyap@...vell.com,
	jmeneghi@...hat.com, yuval.mintz@...gic.com, skalluru@...vell.com,
	pabeni@...hat.com, edumazet@...gle.com, horms@...nel.org,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH v3 net] qede: fix firmware halt over suspend and resume

On Wed, Aug 16, 2023 at 08:37:11PM +0530, Manish Chopra wrote:
> While performing certain power-off sequences, PCI drivers are
> called to suspend and resume their underlying devices through
> PCI PM (power management) interface. However this NIC hardware
> does not support PCI PM suspend/resume operations so system wide
> suspend/resume leads to bad MFW (management firmware) state which
> causes various follow-up errors in driver when communicating with
> the device/firmware afterwards.
> 
> To fix this driver implements PCI PM suspend handler to indicate
> unsupported operation to the PCI subsystem explicitly, thus avoiding
> system to go into suspended/standby mode.
> 
> Without this fix device/firmware does not recover unless system
> is power cycled.
> 
> Fixes: 2950219d87b0 ("qede: Add basic network device support")
> Cc: David Miller <davem@...emloft.net>
> Signed-off-by: Manish Chopra <manishc@...vell.com>
> Signed-off-by: Alok Prasad <palok@...vell.com>

Reviewed-by: Simon Horman <horms@...nel.org>